CVE-2025-39804 (GCVE-0-2025-39804)
Vulnerability from cvelistv5
Published
2025-09-15 12:36
Modified
2025-09-15 12:36
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: lib/crypto: arm64/poly1305: Fix register corruption in no-SIMD contexts Restore the SIMD usability check that was removed by commit a59e5468a921 ("crypto: arm64/poly1305 - Add block-only interface"). This safety check is cheap and is well worth eliminating a footgun. While the Poly1305 functions should not be called when SIMD registers are unusable, if they are anyway, they should just do the right thing instead of corrupting random tasks' registers and/or computing incorrect MACs. Fixing this is also needed for poly1305_kunit to pass. Just use may_use_simd() instead of the original crypto_simd_usable(), since poly1305_kunit won't rely on crypto_simd_disabled_for_test.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/eec76ea5a7213c48529a46eed1b343e5cee3aaab
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/ef74efa598b7bbc5c24509f7f56af2806f81c339
Impacted products
Vendor Product Version
Linux Linux Version: a59e5468a921937cb7317892779c67046ad9f5cc
Version: a59e5468a921937cb7317892779c67046ad9f5cc
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   Linux Linux Version: 6.16
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        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "lib/crypto/arm64/poly1305-glue.c"
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      "descriptions": [
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nlib/crypto: arm64/poly1305: Fix register corruption in no-SIMD contexts\n\nRestore the SIMD usability check that was removed by commit a59e5468a921\n(\"crypto: arm64/poly1305 - Add block-only interface\").\n\nThis safety check is cheap and is well worth eliminating a footgun.\nWhile the Poly1305 functions should not be called when SIMD registers\nare unusable, if they are anyway, they should just do the right thing\ninstead of corrupting random tasks\u0027 registers and/or computing incorrect\nMACs.  Fixing this is also needed for poly1305_kunit to pass.\n\nJust use may_use_simd() instead of the original crypto_simd_usable(),\nsince poly1305_kunit won\u0027t rely on crypto_simd_disabled_for_test."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-09-15T12:36:46.483Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
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        {
          "url": "https://git.kernel.org/stable/c/eec76ea5a7213c48529a46eed1b343e5cee3aaab"
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      ],
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    "assignerShortName": "Linux",
    "cveId": "CVE-2025-39804",
    "datePublished": "2025-09-15T12:36:46.483Z",
    "dateReserved": "2025-04-16T07:20:57.135Z",
    "dateUpdated": "2025-09-15T12:36:46.483Z",
    "state": "PUBLISHED"
  },
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  "dataVersion": "5.1",
  "vulnerability-lookup:meta": {
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  }
}


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